That's really strange. I've re-uploaded it. I think it's something at patreon.com side, I downloaded it and as you said it appeared here as a file called "1". Which is the same size. I'm guessing if I renamed that it would probably work. Any way I've fixed it. Thanks for letting me know.
2021-04-05 09:23:29 +0000 UTC
There's something weird going on with this download, it's not a Var file or any file type for that matter